package map;

import java.util.*;

public class MapDemo2 {
    public static void main(String[] args) {
        Map<String,Integer> map = new HashMap<>();
        map.put("语文",99);
        map.put("数学",98);
        map.put("英语",97);
        map.put("物理",96);
        map.put("化学",99);
        System.out.println(map);
        Set<String> keySet = map.keySet();
        for(String key : keySet){
            System.out.println("key:"+key);
        }
        Set<Map.Entry<String,Integer>> entrySet = map.entrySet();
        for(Map.Entry<String,Integer> entry : entrySet){//遍历每一组键值对
            String key = entry.getKey();
            Integer value = entry.getValue();
            System.out.println(key+":"+value);
        }
        Collection<Integer> values = map.values();
        for(Integer value : values){
            System.out.println("value:"+value);
        }
        Collection<String> c = new ArrayList<>();
        c.add("one");
        c.add("two");
        c.add("three");
        c.add("four");
        c.add("five");
        for(String s : c){
            System.out.println(s);
        }
        c.forEach( s -> System.out.println(s) );
        map.forEach((k,v)-> System.out.println(k+":"+v));
    }
}
